Austin Kerbow 2c82a126d7 [AMDGPU] Omit unnecessary waitcnt before barriers ...

It is not necessary to wait for all outstanding memory operations before
barriers on hardware that can back off of the barrier in the event of an
exception when traps are enabled. Add a new subtarget feature which
tracks which HW has this ability.

Reviewed By: #amdgpu, rampitec

Differential Revision: https://reviews.llvm.org/D130722

2022-07-29 11:12:36 -07:00

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